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· Super Moderator
8,474 Posts
Stuck or leaking valves or jumped timing. I suggest if it's been sitting that many years all the lube has left the valve stems and guides so pulling the covers and spraying some light lube like WD or PB on then as well as down the intakes to the exposed stems for the intakes and..for the exhausts may have to pull the pipes to get to those. Check the valve timing first though.
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